<template>
  <div class="swiper-container" ref="cur">
    <div class="swiper-wrapper">
      <div class="swiper-slide" v-for="(slider, index) in skuImageList" :key="slider.id">
        <img :src="slider.imgUrl" :class="{active:currentIndex==index}" @click="changeCurrentIndex(index)"/>
      </div>
    </div>
    <div class="swiper-button-next"></div>
    <div class="swiper-button-prev"></div>
  </div>
</template>

<script>
import Swiper from "swiper";
export default {
  name: "ImageList",
  data(){
    return{
      currentIndex: 0
    }
  },
  props: ["skuImageList"],
  watch: {
    //监听数据：可以保证数据一定ok，但是不能保证v-for一定遍历显示完成，所以用nextTick
    skuImageList(newValue, oldValue) {
      this.$nextTick(() => {
        new Swiper(
          // document.querySelector(".swiper-container"),
          this.$refs.cur,
          {
            // loop: true, // 循环模式选项
            //显示几个图片的设置，默认为1
            slidesPerView: 3,
            //在轮播时每一次切换图片的个数，默认为1
            slidesPerGroup: 1,

            // // 如果需要分页器
            // pagination: {
            //   el: ".swiper-pagination",
            //   clickable: true
            // },

            // 如果需要前进后退按钮
            navigation: {
              nextEl: ".swiper-button-next",
              prevEl: ".swiper-button-prev"
            }

            // // 如果需要滚动条
            // scrollbar: {
            //   el: '.swiper-scrollbar',
            // },
          }
        );
      });
    }
  },
  methods: {
    changeCurrentIndex(index){
      //修改图片高亮的响应式数据
      this.currentIndex = index
      // 通知兄弟组件：当前的索引值为几  emit(送出去) on(接收)
      this.$bus.$emit('getIndex', this.currentIndex)
    }
  },
};
</script>

<style lang="less" scoped>
.swiper-container {
  height: 56px;
  width: 412px;
  box-sizing: border-box;
  padding: 0 12px;

  .swiper-slide {
    width: 56px;
    height: 56px;

    img {
      width: 100%;
      height: 100%;
      border: 1px solid #ccc;
      padding: 2px;
      width: 50px;
      height: 50px;
      display: block;

      &.active {
        border: 2px solid #f60;
        padding: 1px;
      }

      // &:hover {
      //   border: 2px solid #f60;
      //   padding: 1px;
      // }
    }
  }

  .swiper-button-next {
    left: auto;
    right: 0;
  }

  .swiper-button-prev {
    left: 0;
    right: auto;
  }

  .swiper-button-next,
  .swiper-button-prev {
    box-sizing: border-box;
    width: 12px;
    height: 56px;
    background: rgb(235, 235, 235);
    border: 1px solid rgb(204, 204, 204);
    top: 0;
    margin-top: 0;
    &::after {
      font-size: 12px;
    }
  }
}
</style>